As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FORWARD OVERHEAT LIGHT (WINDOW HEAT) ILLUMINATED AT THE GATE. PERFORMED QRH PROCEDURE. OVERHEAT LIGHT RE-ILLUMINATED. FOUND C/B WINDOW HEAT PWR LEFT FRONT OPEN. CHECKED HISTORY. NO HISTORY. RESET C/B. REF CH 20 60 01. TESTED WINDOW HEAT REF MM 30 41 00 710 801. TESTS OK, NO FAULTS.